Overdrive sensor My car shifts perfect until its supose to shift into overdrive.I took it to a tranmission place and they said its not the transmission its the overdrive sensor and he showed me where to tap on it when it acts up. But he could not fix it for me.Is this something major?

The only difference is my car will not shift into third and fourth automatically. My overdrive flashes constantly and the check engine light is on also. The only difference is my car will not shift into third and fourth automatically. My overdrive flashes constantly and the check engine light is on also.

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strange as it may sound, transmissions do not shift into overdrive to pass
they down shift a ratio to get extra torque from the motor and will stay down shifted until the vacuum actuator shifts it back and only then when the VSS reports to the TCM that a ratio change up is needed will the overdrive click in
If you cannot get OD under any circumstances run the fault codes and check for a problem overdrive servo/ solenoid , TCM unit

The knock sensor fault may be preventing the transmission from shifting to OD. The main engine computer also sends commands to the transmission computer. Your transmission valve body is controlled by electronics.

Make sure u have a good thermostat in it. The engine temp must be at certain temp then a signal is sent to the transmission so it will shift into overdrive. Bought my 4 runner,91, was shifting fine until started getting cold then stopped all of a sudden. Checked the thermostat and it was in but had been gutted which allowed the engine not to warm up sufficient to allow the trans to shift into overdrive. Changed thermostat about $8, hasn't skipped a beat since.

I believe that the solenoid that controls the overdrive is accessable from the transmission pan area. The solenoids that control the shifting are located in the side. The 4t65e transaxle has been known to have problems with overdrive for more than one reason though, so start with that solenoid. If that doesn't work, you may have luck with a shift kit. My car used to shift rapidly in and out of overdrive, after I installed a shift kit, I have had no further issues. I used the '4t65e sk' kit from TransGO.

sounds like the speed sensor on the back of your tranmission housing has gone out or is starting to. i would visit ur local tranny shop n have it checked out also when the overdrive light is flashing usually means there is any issue with drive n overdrive but can also be included with just the speed sensor issue